Photographic camera



Aug. 29, 1939. H. g-ARTELS ET AL PHOTOGRAPH IC CAMERA Filed April 19. 1957 ritenutal Aug. 29,1939

. UNITED STATES PATENT OFFICE p PHOTOGRAPHIC CAMERA Heinrich Bartels, Dresden-Laubegast, and' Otto Mller, Dresden, Germany, assignats to Zeiss' Ikon Aktiengesellschaft, Dresden, Germany 'Application April 19, 1937,Serial No. 137,790

13 claims.

'I'he invention relates to improvements in phol tographic cameras and in particular is directed remove it from the camera or photographic lens f respectively, and place it in front of the eyes of 15 the photographer, 'who While observing the scene to be photographed through the filter rotates the latter until the disturbing light reflections are diminished or eliminated. Thereupon the polarising filter is again applied to the photographic lens in the same relative position determined by the eyes of the photographer. The picture then taken by the camera is devoid of disturbing light reflections. If another object is to be photographed the polarising filter has to be removed again from the photographic lens for determining the best position at which the disturbing light reflections are eliminated.

It is now the principal object of the invention to avoid the disadvantage of the above described known arrangement, which disadvantage consists principally in this, that the polarising filter has to be continuously detached from and again applied to the. photographic lens. In accordance with the invention a single polarising filter is used which selectively may be moved in front of the photographic lens and in front of the eye of the photographer, without the necessity of detaching the polarising filter from the camera or the photographic lens respectively:

In view of the above, it is another object of the invention to provide a carrier for the polarising filter and to attach this carrier in such a manner to the camera casing, that by displacing the carrier the polarising filter may be selectively brought into a position in front'of the vphotographers' eyes or in front of the photographic lens.

Another object of the invention is to arrange the displaceable polarising filter in such a manner'that it may be moved into the path of' the light rays passing through a finder associated with the camera.

It is also an object of the invention to provide or combine the polarising filters with color filters.

With these and other objects in view, as will In order to o In Germany April 23, 1936 ing description having reference to the accomappear hereinafter, the invention consists of the novel arrangements, construction of parts.' and combination of elements described in the follow- Fig. 4 illustratesL in front elevation a box camera equipped with another modified arrangement of a polarising filter,

Fig. 5 is a side elevation of the front portion. of the camera partly in section, on the line V--V 20 of Fig. 4, and l 'l Fig. 6 is a front elevation view of the polariser filter used in the camera illustrated in the Figs. 4 and 5.

In Fig. 1 the box camera i has a front wall r`2.5. provided with a mounting 3 containing the photographic lens (not shown).

The shutter actuating member is designated with 4 and the film .tographer is able to observe the scene to be photographed through the polarising filter 'l and may adjust the same-with respect to the. carrier 40 6 until the disturbing light reflections are eliminated. Then the carrier 6 is rotated about its pivot axis at 8 and positioned in front ofthe lens mounting 3, whereupon the picture may be taken by actuating the shutter.

For the purpose of adjusting the polarlsing filter 'I it is secured in a mounting ring-9 which is rotatably mounted in an opening of the carrier 6, for instance as shown by a thread I0. When the polarising filter 1, in the dotted line 50 position of the carrier 6, has been rotatably ad- -justed to a certain angular position, it will' assume the same angular position with respect to the lens, when by rotating the carrieri about the filter 1 will be arranged in front of thev 55 undesirable light reilections which appeared eliminated when looking throughthe polarising l iilter will likewise appear eliminated from the A(il).

light sensitive layer which is arranged in the 'camera behind the lens.

In the modiiied arrangement of the invention as illustrated by the Figs. 2 and 3, the polarising tllter I2v is rotatably adjustably mounted by means of its mounting ring I3 in a carrier I4 which consistsof a rectangular plate. This carrier plate I4 is slidably mounted in the camera casing I parallel with respect to the front wall 2 of the same and immediately behind this front wall 2. The photographic lens I5 is arranged in a partition walll I6 spaced from the iront wall 2, which latter has an aperture I1 in axial alinement with the lens I5. The shutter is indicated at Il (Fig. 3) and its actuating member with 4 (Fig. 2). Across bar 20 on the top end of the carrier plate I4 serves as a handle to facilitate the slidable displacement of the vpolariser I2 :I'rom a position in front of the lens I5 to a position outside the camera casing as illustrated in Fig. 3.

'I'he rotative adjustment of the polariser I2 for eliminating disturbing light reflections takes place in the position of the carrier I4 as indicated in Fig. 3. Then the carrier I4 with the adjusted polariser I2 thereon is pushed into the camera' and thereby the polariser I2 comes to lie in front of the lens, whereupon the camera is ready for the exposure.

The Figs. 4, 5'and 6 illustrate stillanother modification of the invention. A circular carrier disc 22 is rotatably arranged within the camera 'casingf AI directly in rear of the front wall 2. The carrier disc 22 is provided with a number of. circumferentially spaced apertures, all but one are provided with a polarising filter 23, 24, 25 and 25 respectively. The polarising filters are xedly secured in their respective apertures in such a manner that each iilter permits the passage ofv light at a diiierent angle (0 to 180) with respect to' a radial line of the carrier disc 22 which passes\through the center point of the respective polarising iilter.

The carrier disc 22 is attached to a shaft 28 passing rotatably through the front wall 2 of the camera casing I and being provided at its outer end with a knurled operating knob 29 provided with gradations 30. By rotating the'knob` 29 the carrier .disc 22 is rotated and any one of the polarising filters 23 to 26 may be brought in axial alinement with the aperture I1, which as described with reference to Fig. 3 is arranged in -front of the photographic lens.

1n this last described vemnodimfmt the most suitable polarising filter to be placed in front of the lens is determined by bringing the iilters one after the other into the path of light passing through the finder 32 which according to Figs.

- 4 and 5 is arranged in the topportion of the camera. `It will be noted from Fig. 5 that the polarising iilters 23 to 26 may be brought during the rotation of the carrier disc 22 one at Aa' l time infront of the nder lens l33 which is arrangedspaced behind an opening 34 in the front wall 2 of the camera.

The-operationl of this last described modication of the inventionis'as follows The photog.-

rapher observes' the scene to be photographed*- through the ander 32 and'by rotannglthe knob 23 brings one polarising lter after @other in front, of the finder lens 33. In this wai/' the filter giving the best results, as far as the elimination of undesirable reiiection is concerned, is determined and ,then isl lbrought in front of the photographic lens or -inalinement with the aperture I'I respectively. If a picture Without any polarising iilter is to be taken, then the' carrier disc 22 is rotated until itsaperture 21 is brought in alinement with the aperture I'I.

The carriers 6, I4 and 22 for the polarisingproviding the 'carrier of the polarising dichroic material with color filtering properties.

What We claim as our invention is:

1. In a photographic camera having a photographic objective, the arrangement of polarising means, comprising a carrier for said polarising means, said carrier being movably connected With said camera so as to be movable in a plane at a right angle to the axis of the camera objective for positioning said polarising means selectively in the path of the light rays entering the camera, and in the path of light rays between the'object to be photographed and the eye of the observer respectively, said carrier supporting said polarising means in both said selective positions so that the polarising plane in both positions'has the same angular inclination to the horizontal. 1

2. In a Iphotographic camera having a photographic objective, the arrangement of polarising means, comprising a carrier for said polarising means, said carrier being movably connected with said camera so as to be movable ina plane at a right angle to the axis of the camera objective for positioning said polarising means selectively in the path of the light rays entering the camera and in a place for permitting the user to observe the object to be photographed through said polarising means, said carrier supporting said polarising means in both said selective positions so that the polarising plane in both positions has the same angular inclination to the horizontal, said polarizing means being mounted rotatably adjustably on said carrier.

3. In a photographic camera having a photographic,objective,-the arrangement of polarising means, comprising a carrier for said polarisingV means, said carrier being movably connected With said camera so as to be movable in a plane at a right angle to the axis of the camera objective for positioning said polarising means selectively in the path o'f the light rays entering the camera and in a place for permitting `the user to observe the object to be photographed through said polarising means, said carri'er'supporting said polarising means in both said selective positions so that the polarising plane inboth positions has the sameangular inclination to the horizontal and means for mounting said polarising means for rotary adjustment on said carrier.

4. In a photographic camera provided with a camera casing having a front wall, the. arrangement of polarising means, comprising Iajcarrier for said polarising lmeans, said. carrier being mounted for movement in a plane parallel to said yfrontwall for positioning said polarising means selectively in the path of the light rays entering said camera and in a place for permitting the userto observe the object to be `photographed Ithr gh saidpolarising means said carrier supising means selectively in the path of the light rays entering said camera and in a place for permitting the user to observe the object to be photographed through said polarising means said carrier supporting said polarising means in both said selective positions so that the polarising plane in both positions has the same angular in- .clination to the horizontal.

6. In la photographic camera provided with a camera casing having a front wall, the arrangement of polarising means, comprising aA carrier for said polarising means. said carrier lbeing mounted forslidable movement in a plane paralel to said front wall for positioning said' polarising means selectively in the path of the light rays entering said camera and outside the camera for permitting the user to observe the object' to be photographed through said polarismg means said carrier supporting said polarising means in both said selective positions so that the polarising plane in both positions has the same angular inclination to the horizontal. said polarising means being rotatably adiustably mounted on said slidable carrier for varying the angular position of the polarising plane with respect to the horizontal.

7. Ina photographic camera provided with a camera casing having a front wall, the arrangement of polarising means, including ay carrier for said polarising means supported for rotary movement on said i'ront wall, said carrier beingprovided for moving said polarising means selectively into the path. of the light rays entering the camera and in a position for permitting the user to observe the object to be photographed through said polarising means said carrier supporting said polarising means in both said selective positions so that the polarising plane in both positions has the same angular inclination to the horizontal.

8. y In a photographic camera Provided with -`a camera casing having a iront wall,- the arrangement of polarising means, including a carrier for,

said polarising means supported for rotary movement on said front wall, said carrier being provided for4 moving said polarising means selectively into the path of the light rays lentering the camera and in a position for permitting the user to observe the object to be photographed through said polarising means, and means' tor mounting said polarising means for rotary adjustment on said carrier in a plane parallel to the front wall ofthe camera.

9. In.a photographic camerafprovided with a camera casing having a front wall, the arrangement of polarising means. including a rotatable carrier supported for rotative movement on said iront wall, and a plurality of polarising iilters mounted on said rotatable carrier in a plane parallel to the iront -wall oi' the camera and uniformly spaced radially from the axis ot rotation of said carrier, said polarising iilters upon rotation of said carrier being adapted to be moved ta'tive movement on said front wall, and a plui rality of polarisinglters mounted, on said rotatable carrier in a plane parallel to the front wall of the camera. and uniformly spaced radially from the axis of rotation of said carrier, said polarising iilters upon rotation of said carrier being adapted to be moved selectively one at a time into the path of light entering the camera and into a position to permit the user to observe the object to be photographed through the selected polarising iilter, and means arranged at the outside of said casing and connected with said carrier for eii'ecting rotation of the same.

11. In a photographic camera provided with a camera casinghaving a front wall and a ilnder, the arrangement of polarising means, including a rotatable carrier supported for rotative movement on said front wall, and a plurality of polarising lters mounted on said rotatable carrier-in a plane parallel to the front wall ofthe camera and uniformly spaced radially from the axis of rotation of said carrier being adapted to be moved selectively.y one at a time into the path oi' the light rays entering the camera and into the path of the light rays entering said ilnder..

12. In a photographic camera provided with a camera casing having a front wall, the arrangement of polarising means, including a rotatable carrier supported for rotative movement on said front wall, and a plurality of polarising iilt'ers mounted on said rotatable carrier in a plane parallel to the front wall of the camera and uniform-ly spaced radially from the axisof rotation oi said carrier, said polarising iilters upon rotation of said carrier being adapted to be moved selectively one at a time into the path oi light entering the camera and into a position to permit the user to observe the object to be photographed through the selected polarising `iilter, the arrangement of the polarising lters'on said carrier being such, that the polarising plane .of each iilter forms a. diierent angle with respect to a plane. passing through the center of the carrier yand the center o! the respective lter.

13.- In a photographic camerawith a camera casing having a front wall and a iilter, the arrangement of polarising means including a rotatable carrier supported for rotative movement onsaid iront wall, and a plurality oi polarising filters mounted on said rotatable carrier in a plane parallel to the iront wall of the camera and uniformly spaced radially from theaxis of rotation ot said carrier, said polarising filter upon rotation of said carrier being adapted to be moved selectiveiy one at a, timev into the path ot the light rays entering thecamera and into the'path o! the light rays entering said finder, the arrange- 

